/*
 *   Copyright 2021 zzh
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 */

package com.aduib.boot.common.util;

import com.aduib.boot.common.exception.CommonException;

import javax.servlet.http.HttpServletRequest;

/**
 * @author ZZH
 * @version 1.0.0
 */
public class IPUtils {

  /**
   * 获取IP地址
   *
   * <p>使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
   * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
   */
  public static String getIpAddr(HttpServletRequest request) {
    String ip = null;
    try {
      ip = request.getHeader("x-forwarded-for");
      if (StrUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("Proxy-Client-IP");
      }
      if (StrUtils.isBlank(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("WL-Proxy-Client-IP");
      }
      if (StrUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_CLIENT_IP");
      }
      if (StrUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("HTTP_X_FORWARDED_FOR");
      }
      if (StrUtils.isBlank(ip) || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getRemoteAddr();
      }
    } catch (Exception e) {
      throw new CommonException(String.format("IP %s ERROR ", ip));
    }

    //        //使用代理，则获取第一个IP地址
    //        if(StringUtils.isEmpty(ip) && ip.length() > 15) {
    //			if(ip.indexOf(",") > 0) {
    //				ip = ip.substring(0, ip.indexOf(","));
    //			}
    //		}

    return ip;
  }
}
